1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <inttypes.h> 18 #include <sstream> 19 20 #include "time_utils.h" 21 22 #include "base/logging.h" 23 #include "base/stringprintf.h" 24 25 #if defined(__APPLE__) 26 #include <sys/time.h> 27 #endif 28 29 namespace art { 30 31 std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) { 32 if (nano_duration == 0) { 33 return "0"; 34 } else { 35 return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration), 36 max_fraction_digits); 37 } 38 } 39 40 TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) { 41 const uint64_t one_sec = 1000 * 1000 * 1000; 42 const uint64_t one_ms = 1000 * 1000; 43 const uint64_t one_us = 1000; 44 if (nano_duration >= one_sec) { 45 return kTimeUnitSecond; 46 } else if (nano_duration >= one_ms) { 47 return kTimeUnitMillisecond; 48 } else if (nano_duration >= one_us) { 49 return kTimeUnitMicrosecond; 50 } else { 51 return kTimeUnitNanosecond; 52 } 53 } 54 55 uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) { 56 const uint64_t one_sec = 1000 * 1000 * 1000; 57 const uint64_t one_ms = 1000 * 1000; 58 const uint64_t one_us = 1000; 59 60 switch (time_unit) { 61 case kTimeUnitSecond: 62 return one_sec; 63 case kTimeUnitMillisecond: 64 return one_ms; 65 case kTimeUnitMicrosecond: 66 return one_us; 67 case kTimeUnitNanosecond: 68 return 1; 69 } 70 return 0; 71 } 72 73 std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit, 74 size_t max_fraction_digits) { 75 const char* unit = nullptr; 76 uint64_t divisor = GetNsToTimeUnitDivisor(time_unit); 77 switch (time_unit) { 78 case kTimeUnitSecond: 79 unit = "s"; 80 break; 81 case kTimeUnitMillisecond: 82 unit = "ms"; 83 break; 84 case kTimeUnitMicrosecond: 85 unit = "us"; 86 break; 87 case kTimeUnitNanosecond: 88 unit = "ns"; 89 break; 90 } 91 const uint64_t whole_part = nano_duration / divisor; 92 uint64_t fractional_part = nano_duration % divisor; 93 if (fractional_part == 0) { 94 return StringPrintf("%" PRIu64 "%s", whole_part, unit); 95 } else { 96 static constexpr size_t kMaxDigits = 30; 97 size_t avail_digits = kMaxDigits; 98 char fraction_buffer[kMaxDigits]; 99 char* ptr = fraction_buffer; 100 uint64_t multiplier = 10; 101 // This infinite loops if fractional part is 0. 102 while (avail_digits > 1 && fractional_part * multiplier < divisor) { 103 multiplier *= 10; 104 *ptr++ = '0'; 105 avail_digits--; 106 } 107 snprintf(ptr, avail_digits, "%" PRIu64, fractional_part); 108 fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0'; 109 return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit); 110 } 111 } 112 113 std::string GetIsoDate() { 114 time_t now = time(nullptr); 115 tm tmbuf; 116 tm* ptm = localtime_r(&now, &tmbuf); 117 return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d", 118 ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday, 119 ptm->tm_hour, ptm->tm_min, ptm->tm_sec); 120 } 121 122 uint64_t MilliTime() { 123 #if defined(__linux__) 124 timespec now; 125 clock_gettime(CLOCK_MONOTONIC, &now); 126 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000); 127 #else // __APPLE__ 128 timeval now; 129 gettimeofday(&now, nullptr); 130 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000); 131 #endif 132 } 133 134 uint64_t MicroTime() { 135 #if defined(__linux__) 136 timespec now; 137 clock_gettime(CLOCK_MONOTONIC, &now); 138 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 139 #else // __APPLE__ 140 timeval now; 141 gettimeofday(&now, nullptr); 142 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec; 143 #endif 144 } 145 146 uint64_t NanoTime() { 147 #if defined(__linux__) 148 timespec now; 149 clock_gettime(CLOCK_MONOTONIC, &now); 150 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 151 #else // __APPLE__ 152 timeval now; 153 gettimeofday(&now, nullptr); 154 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000); 155 #endif 156 } 157 158 uint64_t ThreadCpuNanoTime() { 159 #if defined(__linux__) 160 timespec now; 161 clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now); 162 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 163 #else // __APPLE__ 164 UNIMPLEMENTED(WARNING); 165 return -1; 166 #endif 167 } 168 169 void NanoSleep(uint64_t ns) { 170 timespec tm; 171 tm.tv_sec = ns / MsToNs(1000); 172 tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000); 173 nanosleep(&tm, nullptr); 174 } 175 176 void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) { 177 int64_t endSec; 178 179 if (absolute) { 180 #if !defined(__APPLE__) 181 clock_gettime(clock, ts); 182 #else 183 UNUSED(clock); 184 timeval tv; 185 gettimeofday(&tv, nullptr); 186 ts->tv_sec = tv.tv_sec; 187 ts->tv_nsec = tv.tv_usec * 1000; 188 #endif 189 } else { 190 ts->tv_sec = 0; 191 ts->tv_nsec = 0; 192 } 193 endSec = ts->tv_sec + ms / 1000; 194 if (UNLIKELY(endSec >= 0x7fffffff)) { 195 std::ostringstream ss; 196 LOG(INFO) << "Note: end time exceeds epoch: " << ss.str(); 197 endSec = 0x7ffffffe; 198 } 199 ts->tv_sec = endSec; 200 ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns; 201 202 // Catch rollover. 203 if (ts->tv_nsec >= 1000000000L) { 204 ts->tv_sec++; 205 ts->tv_nsec -= 1000000000L; 206 } 207 } 208 209 } // namespace art 210
